Shaft pushing device

Abstract

A shaft pushing device includes a driving mechanism with a threaded tube and a push rod movably extends through the threaded tube. A grasp mechanism has a first ring threadedly mounted to the threaded tube and a plurality of pawls are pivotably connected to the first ring. An adjusting mechanism has an adjusting nut threadedly mounted to the threaded tube and located between the first ring and the distal end of the push rod. A second ring is mounted to the adjusting nut and a plurality of stretch rods are pivotably connected between the pawls and the second ring. The push rod is driven to extend from the threaded tube to push against an end of the shaft and the pawls are pivoted to grasp the gear mounted to the shaft by operating the adjusting nut. The shaft is disengaged from the gear by the push rod.

1. A shaft pushing device comprising:
 a driving mechanism having a threaded tube with a threaded outer periphery and a push rod movably extending through the threaded tube, a distal end of the push rod extending out from an end of the threaded tube; 
 a grasp mechanism having a first ring threadedly mounted to the threaded tube and a plurality of pawls pivotably connected to the first ring, each pawl having a hook end, and 
 an adjusting mechanism having an adjusting nut threadedly mounted to the threaded tube and located between the first ring and the distal end of the push rod, a second ring mounted to the adjusting nut and a plurality of stretch rods pivotably connected between the pawls and the second ring whereby the adjusting nut when turned moves the threaded nut and the second ring axially along the threaded tube and thereby adjusts the hook ends of the pawls inward or outward. 
 
   
   
     2. The device as claimed in  claim 1 , wherein a driving device is connected to the other end of the threaded tube so as to push the push rod. 
   
   
     3. The device as claimed in  claim 1 , wherein the threaded tube includes a threaded inner periphery and the push rod is threadedly connected to the threaded inner periphery of the threaded tube, a driving device is connected to the push rod. 
   
   
     4. The device as claimed in  claim 1 , wherein the first ring includes a plurality of first extensions and the pawls are pivotably connected to the first extensions. 
   
   
     5. The device as claimed in  claim 1 , wherein the second ring includes a plurality of second extensions and the stretch rods are pivotably connected to the second extensions. 
   
   
     6. The device as claimed in  claim 1 , wherein the stretch rods are pivotably connected to respective middle portions of the pawls. 
   
   
     7. The device as claimed in  claim 1 , wherein the second ring includes a first groove defined in an inner periphery thereof and the adjusting nut includes a second groove defined in an outer periphery thereof, C-clamp is engaged with the first groove and the second groove which is located in alignment with the first groove.